a. There are plenty of things in the air you may want to remove-smoke, odors, pollen, allergens, etc. I’ll collectively refer to these as “dust” going forward. Typically, we aim to keep these levels low-in the μg/m3 range. Outdoor air may have 100–300 μg/m3, whereas we strive for much lower values indoors. To do that, we use air filters. A standard air filter is 4 in. (100 mm) thick, 20 x 25 in. cross section, D = 8 × 10-11 m2/s, with no dust in it when it’s new (Co = 0 kg/m3). Suppose the outdoor air has 100 μg/m3 of dust, whereas the indoor we want the indoor air to be less than 20 μg/m3. How long will it take (in years) for the far side of the filter to reach this value? (We will refer to this as the baseline case going forward).
a. There are plenty of things in the air you may want to remove-smoke, odors, pollen, allergens, etc. I’ll collectively refer to these as “dust” going forward. Typically, we aim to keep these levels low-in the μg/m3 range. Outdoor air may have 100–300 μg/m3, whereas we strive for much lower values indoors. To do that, we use air filters. A standard air filter is 4 in. (100 mm) thick, 20 x 25 in. cross section, D = 8 × 10-11 m2/s, with no dust in it when it’s new (Co = 0 kg/m3). Suppose the outdoor air has 100 μg/m3 of dust, whereas the indoor we want the indoor air to be less than 20 μg/m3. How long will it take (in years) for the far side of the filter to reach this value? (We will refer to this as the baseline case going forward).
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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a. There are plenty of things in the air you may want to remove-smoke, odors, pollen, allergens, etc. I’ll collectively refer to these as “dust” going forward. Typically, we aim to keep these levels low-in the μg/m3 range. Outdoor air may have 100–300 μg/m3, whereas we strive for much lower values indoors. To do that, we use air filters.
A standard air filter is 4 in. (100 mm) thick, 20 x 25 in. cross section, D = 8 × 10-11 m2/s, with no dust in it when it’s new (Co = 0 kg/m3). Suppose the outdoor air has 100 μg/m3 of dust, whereas the indoor we want the indoor air to be less than 20 μg/m3. How long will it take (in years) for the far side of the filter to reach this value? (We will refer to this as the baseline case going forward).
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